Enhancement: adapt the \skip command to automatically-aligned lyrics mode

[Valentin Villenave]

NR 2.1.2 states that
"The \skip command must be followed by a number,
but this number is ignored in lyrics which derive their durations
from the notes in an associated melody through \addlyrics or
\lyricsto.  Each \skip skips a single note of any
value, irrespective of the value of the following number."

Which means that right now you have to do
<<
  \new Voice = "foo" { b b b b b b b b }
  \new Lyrics \lyricmode {
    \skip 1 blah4 }
  %% BUT:
  \new Lyrics \lyricsto "foo" {
    \repeat unfold 4 \skip 1 blah }
>>

I suggest that either \skip wouldn't require a number when in
automatically-aligned \lyricsto mode, or that the number indicates the
number of syllables to skip (rather than a duration), which would
allow users not to use the \repeat unfold hack.

(Granted, this looks like a GLISS discussion.)

GLHF
Valentin.